◎ 题干
The great invention he made _____ of great benefit to the whole world.
[      ]
A. is proved
B. has proved
C. has been proved
D. is proved to be
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“The great invention he made _____ of great benefit to the whole world.[ ]A. is proved B. has proved C. has been provedD. is proved to be …”主要考查了你对  【动词】【现在完成时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。